2017 Mercedes-Benz CLS550 Has A Vacuum Leak

Diagnosing Vacuum Leaks in Your 2017 Mercedes-Benz CLS550 and Effective Repair Strategies

Find Repair Location
Reviewed by
Aisha
Written by RepairPal Car Genius
Updated January 14, 2025
0%
40% chance it's the
Leaking Vacuum Hoses
0%
30% chance it's the
Leaking Gaskets and Seals
0%
20% chance it's the
Bad Actuators and Valves
0%
10% chance it's
Something else
The most common reasons a 2017 Mercedes-Benz CLS550 has a vacuum leak are leaking vacuum hoses, leaking gaskets and seals, or bad actuators and valves.
  • Leaking Vacuum Hoses: A cracked or disconnected vacuum hose can lead to a loss of engine vacuum, resulting in poor engine performance and increased fuel consumption.
  • Leaking Gaskets and Seals: Aged or damaged gaskets and seals can lead to fluid leaks, resulting in loss of engine oil or coolant and potential engine damage.
  • Bad Actuators and Valves: A malfunctioning actuator or valve can disrupt the proper operation of the vehicle's systems, leading to issues such as poor engine performance or erratic behavior of components like the HVAC system.
Proper diagnosis will determine the exact cause of your symptom, saving you money on unnecessary repairs. The diagnostic experts at RepairPal Certified shops have the right tools and experience to solve any symptom.

How much does it cost to fix a 2017 Mercedes-Benz CLS550 has a vacuum leak?

Common Repairs

The total repair cost will vary based on the condition of your vehicle and the number of repairs needed to fix your symptom. Proper diagnosis will save you money by finding the exact repairs needed to fix your car right the first time.

Problems with the intake manifold gasket can create the following symptoms:

  • Illuminated check engine light
  • Erratic engine performance
  • Oil and coolant leaks
  • Poor gas mileage
  • Stalling

» LEARN MORE: Intake manifold gasket symptoms

Any time there is an emissions fault the check engine light will be displayed. The purpose of the check engine light is to inform the driver that an emission related fault has been found, and that there are on-board diagnostic (OBD) trouble codes stored in the powertrain or engine control module. Additionally, since the emissions systems are so intertwined into engine control and transmission control systems, symptoms may include nearly any sort of drivability concerns. This may include harsh shifting, failure to shift, hesitation on acceleration, jerking, engine failure to start or run, loss of power, or any number of other drivability issues.

What are the steps to diagnose a vacuum leak in a 2017 Mercedes-Benz CLS550?

To effectively diagnose a vacuum leak in your 2017 Mercedes-Benz CLS550, start with a thorough visual inspection of the vacuum hoses. Look for any signs of wear, such as cracks or loose connections, which can often be the source of leaks. Next, listen for any hissing sounds while the engine is running, as these can indicate escaping air. If you suspect a leak but can't pinpoint it, using a smoke machine can be highly effective; it introduces smoke into the vacuum system, allowing you to see where it escapes. Alternatively, spraying soapy water on the hoses and connections can reveal leaks through the formation of bubbles. For a more precise assessment, utilize a vacuum gauge to measure the vacuum levels; lower readings may suggest a leak. Additionally, scanning for error codes with a diagnostic tool can provide insights into any underlying issues related to the vacuum system. If these methods do not yield results, it may be wise to consult a professional mechanic who can offer specialized tools and expertise for a more comprehensive diagnosis. By following this structured approach, you can systematically identify and address any vacuum leaks in your vehicle.

What are the common problems associated with vacuum leaks in a 2017 Mercedes-Benz CLS550?

When diagnosing vacuum leaks in a 2017 Mercedes-Benz CLS550, it's essential to recognize the symptoms that can indicate underlying issues. One of the most noticeable signs is rough idling, where the engine may struggle to maintain a steady RPM, leading to an inconsistent driving experience. Additionally, you may experience poor fuel efficiency, as the disruption in the air-fuel mixture can cause the engine to consume more fuel than necessary. This inefficiency often triggers the check engine light, alerting you to a problem that requires attention. Furthermore, a vacuum leak can result in a significant loss of power, affecting acceleration and overall vehicle performance, which can be particularly concerning during driving. In severe cases, these leaks may even lead to engine stalling, posing safety risks on the road. Addressing these issues promptly is crucial to maintaining the vehicle's performance and preventing further damage, making it vital for DIY enthusiasts to be vigilant about these common problems.

How urgent is it to address a vacuum leak in a 2017 Mercedes-Benz CLS550?

Addressing a vacuum leak in your 2017 Mercedes-Benz CLS550 is not just a matter of convenience; it is a pressing concern that can significantly impact your vehicle's performance and safety. A vacuum leak can lead to a range of engine issues, including rough idling and stalling, which can compromise your driving experience and increase the risk of accidents. Moreover, neglecting this problem can result in further damage to essential components like the oxygen sensors and catalytic converter, leading to costly repairs down the line. Additionally, a vacuum leak often triggers the check engine light, signaling that immediate attention is required. Therefore, it is crucial to prioritize the repair of a vacuum leak to maintain the optimal functioning of your vehicle and avoid more severe complications in the future.

You’ve got options with RepairPal

Whether you need a more accurate auto repair estimate or help finding a reputable shop in your area, we’ve got you covered.

2017 Mercedes-Benz CLS550 Vacuum Leak Causes & Repair Costs